Kayla and Riley both solved the equation x-15 = 13-7, using substitution. Kayla says the answer is x=21, and Riley says that answer is x=28. Which student is correct?(1 point)
Responses
Kayla
Kayla
Riley
Riley
Neither
Neither
Both
To determine who is correct, we need to solve the equation using substitution.
Starting with Kayla's answer, x=21, we substitute this value into the equation to see if it is true.
x - 15 = 13 - 7
21 - 15 = 13 - 7
6 = 6
Since both sides of the equation are equal, Kayla's answer, x=21, is correct.
Therefore, the correct answer is Kayla.